/ 
148 Dr. C. W. Andrews on 
The precise systematic position of this chelonian is not 
certain, but it must belong either to the Amphichelydia or to 
the Pleurodira. It may be referred to the genus Trachyder- 
mochelys, founded by Seeley * for the reception of some 
scutes from the Cambridge Greensand, possessing a nearly 
identical type of sculpture, their specific name being T. phly- 
ctenus ; the species has never been properly described and 
figured, and Lydekker T has suggested that these scutes may 
actually belong to species of Rhinochelys. This, however, is 
by no means certain, and I therefore prefer to employ the 
name Trachydermochelys given to the sculptured scutes. In 
the Cambridge Greensand species the sculpture is consider- 
ably finer than in the present specimen, which, moreover, is 
from a different horizon: for these reasons I propose to refer 
it to a new species, for which the name Trachydermochelys 
rutteri is proposed. 
A Chelonian shell from the Upper Greensand of the Isle 
of Wight was described by Owen (quoted by C. Parkinson) 
in the Quart. Journ. Geol. Soc. vol. xxxvui. 1881, p. 870, 
and was made the type of a new genus and species under the 
name Plastremys lata. This specimen is R. 48 of the British 
Museum collection. The only character mentioned by Owen 
is the absence of the mesoplastral elements, and this is an 
error ; the promised further description never appeared. In 
1889, Lydekker (Catal. Foss. Rept. Brit. Mus. pt. iii. p. 195) 
referred this specimen to his genus Hyleochelys, repeating 
the statement that mesoplastra are absent. Re-examination 
of the shell, however, shows that not only were these elements 
present but that they were large, and that a sculpture similar 
to that of Trachodermochelys, though not so strongly marked, 
was present in the region of the bridge, the rest of the shell 
so far as known being smooth. It seems almost certain that 
this specimen represents another species of Trachyder- 
mochelys, the name of which would be Trachydermochelys 
lata, Owen, sp. 
The second specimen here described is part of the carapace 
of a tortoise from the Barton Clay at the foot of Higheliff, 
near Christchurch, Hants. It is preserved in the Museum 
of Practical Geology, Jermyn Street (No. 20497). The parts 
of the shell present are: the right half of the nuchal bone, 
the five anterior marginals, the five anterior neurals, the four 
auterior costals, and part of the fifth on the right side, while 
* “Index to Aves ete. in the Cambridge Museum,’ pp. xix & 33 (1869). 
These specimens have never been properly figured or described. 
¢ Lydekker, Catal, Foss. Rept. Brit. Mus. pt. 3, p. 182. 
